Improvement in tackle-blocks



l ELLBS 00w.

iimprovem'ent in Tackie-B'locks Na. 115,450fl Patented May 30,1871.

W/WESSGS'L their revolutions in equal times.

PATENT QFFIGE.

ELLIS DOTY, OF JANESVILLE, WISCONSIN.

IMPROVEMENT m TACKLE-BLOCKS.

Specification forming part of Letters Patent No. 115,450, dated May 30,1871.

To all whom it may concern.-

- Be it known that I, ELLIs DUTY, of Janesville, in the county o'fItockand State of Wisconsin, have invented anew and valuable Improvement inTackle-Blocks; and I do hereby declare that .the following is a full,clear, andexact description of theconst-ruction andoperation of thesame, reference being had to the annexed drawing making apart of thisspecification,and to the letters and figures of reference markedthereon.

Figure 1 ofthe drawing is a perspective view of my invention, showingits application. Fig. 2 is a central vertical longitudinal section.

My inventionhas r'elation'to an improvement in the construction oftackle-blocks,

whereby all the advantages of separate wheels are derived without theunnecessary friction of the faces of the hubs against each other;

' and it consists in providing one of the wheels of the block with anelongated hub or sleeve, upon which the other wheels rotate, all thewheels being graduated to make their revolutions in equal time.

The letter A of the. drawing designates the frame or body of thetackle-block, within which the wheels are situated. B represents theaxle secured to the walls of the block. The fixed axle isfpreferred tothe shaft journaled in bearingsin the walls of the frame A, because,.bythe use of the sleeve-hub hereinafter described,

the bearing is distributed evenly over a greater surface. 0 GOQdesignate the wheels of the-block, which are so graduated in diameterwith respect to each other and with respect to I the wheels of the loweror pendent tackle that,

when therope or cord is properly reeved and attached, the wheels of eachblock will make Either of r the wheels of the tackle-block maybeprovided with the elongated sleeve d. For convenience in oiling andother advantages thereby attained, I prefer attaching this sleeve to themiddle wheel. The ends ofthe sleeve extend outward on either side, andare brought in contact with the walls of the block or frame againstwhich they rotate. The other wheels of the tackle are slipped on thesleeve (1, and r will make their revolutions in equal times, and therewill be no friction between them, either.

on the sleeve or when the faces of the hubs come in contact; but, inpractice, it is not feasibleto use rope of the character abovedescribed. Itis never homogeneous, and always furnishedmore or less withexcrescences and inequalities.

The mode herein described of constructing the tackle-block is designedto approximate, ,as nearly as the inequalities of the rope will admit,equality in the time of the revolutions of the wheels while at the sametime-the i11- dependent movement of each wheel is permitted, and thebearing of each of the wheelsis distributed over the entire shaft of thepulleyblock.

I claim as my invention- 1. In a tackle-block, the independent wheels 0G U", graduated to make their, revolutions in equal times, substantiallyas specified.

2. In a tackle-block, a wheel provided with an extended hub to serve asa bearing for the other wheels of the block, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

ELLIS DOTY. Witnesses:

D. D. KANE,- I B. (JURTIs. I

